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Finding the Fourth Proportional to 120,012.80, 179,932.80 and 67,438.40

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Solution

The fourth proportional to 120,012.80, 179,932.80 and 67,438.40 is: 101,109.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,012.80 : 179,932.80 = 67,438.40 : x
  2. Step 2: Convert to fraction form
    120,012.80/179,932.80 = 67,438.40/x
  3. Step 3: Cross multiply
    120,012.80x = 179,932.80 × 67,438.40
  4. Step 4: Simplify right side
    120,012.80x = 12,134,380,139.52
  5. Step 5: Solve for x
    x = 12,134,380,139.52/120,012.80
  6. Step 6: Final answer
    x = 101,109.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.